# Nivalth

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bio website physics.stackexchange.com/… location Spain age 26 member for 2 years, 2 months seen 13 hours ago profile views 222

 2d accepted If photons don't interact directly, how can electromagnetic waves interfere? Dec18 asked If photons don't interact directly, how can electromagnetic waves interfere? Dec2 accepted Higgs mechanism in QED Dec2 comment Higgs mechanism in QED So I may compute the two products and multiply them. What about commutation issues of derivatives of the components of the perturbation field and the field ? Dec2 asked Higgs mechanism in QED Oct24 comment Writing a Wavefunction as a Linear Combination of Eigenstates Hint: orthonormalization relationships. Oct20 awarded Popular Question Oct14 awarded Yearling Oct12 comment Why in Newton's law of gravity, we do $M_1 \times M_2$ and not $M_1 + M_2$? what about just dimensional analysis? Oct4 awarded Tumbleweed Sep28 asked Relation between brightness and magnitude Sep27 asked Galactic flux given magntiudes Sep24 revised Klein-Gordon propagator integral rewriting of question Sep23 comment Klein-Gordon propagator integral Hi Thanks. If the integral is for $p_0 \in \mathbb{R}$ is there any problem with the semicircles in both poles? Usually the countour is a semicircle stricly, this more or less the same but not exactly Sep23 comment Klein-Gordon propagator integral Hi thanks. If the poles are displaced from the real axis some $i \epsilon$ then you always get one pole don't you? Sep22 comment Klein-Gordon propagator integral Yes, my particular problem is with the countour of integration, being a semicircle but with two semicircles at $\pm E_p$. Is in page 30 of the book Sep22 comment Klein-Gordon propagator integral Yes, I know this is related to residues theorem but I don't see those particular integrals Sep22 asked Klein-Gordon propagator integral Sep14 revised Non-relativistic limit of complex scalar field improved format (latex) Sep14 suggested suggested edit on Non-relativistic limit of complex scalar field